US3713430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system
Assignee: Robert Bosch GmbH
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Filing: 1970-10-16
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Granted: 1973-01-30
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Expires: 1990-10-16
Abstract
Abstract The supply of fuel to an internal combustion engine is controlled by a sensor plate mounted in the suction duct and which deflects in response to air intake rate into a conically flared duct portion. The plate is mounted on a pivoted arm, on which is pivotably mounted a rocker engaging the slider of a fuel measuring distributor valve. Pivotal movement of the arm causes a roller to sense a cam surface and adjust the rocker. The cam surface is movable in response to an engine operating condition to provide different relationships.
Inventors
- 👤 H Knapp
- 👤 R Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:41
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/16; F02M69/26; F02M69/18; F02M69/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
277 words
In a fuel injection system for an external-ignition combustion engine operating on fuel continuously injected into the suction duct and including an arbitrarily controllable throttle member in said suction duct, said system being of the type that includes (a) a fuel distributor valve having a movable valve member for metering the fuel quantities supplied to said engine, (b) an air sensor means being at least partially positioned in said suction duct spaced from said throttle member, said air sensor means being movable in said suction duct by and as a function of the air flowing in said suction duct, (c) coupling means for transmitting the motion of said air sensor to said movable valve member, said last-named means determining the positional relationship between said movable valve member and said air sensor means and (d) means for applying to said sensor member a substantially constant return force to ensure a linear proportionality between the rate of air flow in said suction duct and the amount of fuel metered by said fuel distributor valve, the improvement comprising A. shiftable means connected to said coupling means for changing said positional relationship between said movable valve member and said air sensor means to change the factor of said linear proportionality, said shiftabLe means and said means for applying to said sensor member a substantially constant return force being separate and independent from one another whereby a change in said positional relationship leaves said return force unaffected and B. means moving in response to at least one operating characteristic of said engine, said last-named means being connected to said shiftable means to vary said factor as a function of said operating characteristic.
Claim 2
Dependent Claim
277 words
In a fuel injection system for an external-ignition combustion engine operating on fuel continuously injected into the suction duct and including an arbitrarily controllable throttle member in said suction duct, said system being of the type that includes (a) a fuel distributor valve having a movable valve member for metering the fuel quantities supplied to said engine, (b) an air sensor means being at least partially positioned in said suction duct spaced from said throttle member, said air sensor means being movable in said suction duct by and as a function of the air flowing in said suction duct, (c) coupling means for transmitting the motion of said air sensor to said movable valve member, said last-named means determining the positional relationship between said movable valve member and said air sensor means and (d) means for applying to said sensor member a substantially constant return force to ensure a linear proportionality between the rate of air flow in said suction duct and the amount of fuel metered by said fuel distributor valve, the improvement comprising A. shiftable means connected to said coupling means for changing said positional relationship between said movable valve member and said air sensor means to change the factor of said linear proportionality, said shiftabLe means and said means for applying to said sensor member a substantially constant return force being separate and independent from one another whereby a change in said positional relationship leaves said return force unaffected and B. means moving in response to at least one operating characteristic of said engine, said last-named means being connected to said shiftable means to vary said factor as a function of said operating characteristic.
Claim 3
Dependent Claim
277 words
In a fuel injection system for an external-ignition combustion engine operating on fuel continuously injected into the suction duct and including an arbitrarily controllable throttle member in said suction duct, said system being of the type that includes (a) a fuel distributor valve having a movable valve member for metering the fuel quantities supplied to said engine, (b) an air sensor means being at least partially positioned in said suction duct spaced from said throttle member, said air sensor means being movable in said suction duct by and as a function of the air flowing in said suction duct, (c) coupling means for transmitting the motion of said air sensor to said movable valve member, said last-named means determining the positional relationship between said movable valve member and said air sensor means and (d) means for applying to said sensor member a substantially constant return force to ensure a linear proportionality between the rate of air flow in said suction duct and the amount of fuel metered by said fuel distributor valve, the improvement comprising A. shiftable means connected to said coupling means for changing said positional relationship between said movable valve member and said air sensor means to change the factor of said linear proportionality, said shiftabLe means and said means for applying to said sensor member a substantially constant return force being separate and independent from one another whereby a change in said positional relationship leaves said return force unaffected and B. means moving in response to at least one operating characteristic of said engine, said last-named means being connected to said shiftable means to vary said factor as a function of said operating characteristic.
Claim 4
Dependent Claim
277 words
In a fuel injection system for an external-ignition combustion engine operating on fuel continuously injected into the suction duct and including an arbitrarily controllable throttle member in said suction duct, said system being of the type that includes (a) a fuel distributor valve having a movable valve member for metering the fuel quantities supplied to said engine, (b) an air sensor means being at least partially positioned in said suction duct spaced from said throttle member, said air sensor means being movable in said suction duct by and as a function of the air flowing in said suction duct, (c) coupling means for transmitting the motion of said air sensor to said movable valve member, said last-named means determining the positional relationship between said movable valve member and said air sensor means and (d) means for applying to said sensor member a substantially constant return force to ensure a linear proportionality between the rate of air flow in said suction duct and the amount of fuel metered by said fuel distributor valve, the improvement comprising A. shiftable means connected to said coupling means for changing said positional relationship between said movable valve member and said air sensor means to change the factor of said linear proportionality, said shiftabLe means and said means for applying to said sensor member a substantially constant return force being separate and independent from one another whereby a change in said positional relationship leaves said return force unaffected and B. means moving in response to at least one operating characteristic of said engine, said last-named means being connected to said shiftable means to vary said factor as a function of said operating characteristic.
Claim 5
Dependent Claim
17 words
A system according to claim 1, in which said operating characteristic is the rpm of the engine.
Claim 6
Dependent Claim
13 words
A system according to claim 1, in which said operating characteristic is temperature.
Claim 7
Dependent Claim
19 words
A system according to claim 1, in which said operating characteristic is the degree of loading of said engine.
Claim 8
Dependent Claim
61 words
A system according to claim 1, in which said air sensor means comprises a plate mounted at an end of a movable arm, the other end of said arm being pivoted at a fixed point, a rocker being pivotably mounted on said arm for engaging said movable valve member, said rocker forming part of said coupling means and said shiftable means.
Claim 9
Dependent Claim
58 words
A system according to claim 5, in which said means moving in response to an operating characteristic comprises a surface cam and said shiftable means comprises a follower engaging said surface cam, said follower being angularly adjustable relative to said movable arm in the plane of movement thereof and coupled for controlling the angular position of said rocker.
Claim 10
Dependent Claim
17 words
A system according to claim 6, in which said surface cam is adjustable perpendicularly to said plane.
Claim 11
Dependent Claim
31 words
A system according to claim 1, comprising means for supplying pressure liquid to exert a continuous return force of normally constant pressure on said movable valve member of said distributor valve.
Claim 12
Dependent Claim
23 words
A system according to claim 8, comprising a pressure line for supplying said pressure liquid, a damping restriction being provided in said line.
Claim 13
Dependent Claim
21 words
A system according to claim 9, in which said pressure liquid is fuel and said movable valve member comprises a slider.
Claim 14
Dependent Claim
72 words
A system according to claim 8, comprising a flow regulator provided in said fuel supply line downstream of said distributor valve for causing a transitory adjustment of said return pressure, spring means exerting pressure in the closing direction on said regulator and means for subjecting said regulator in the opening direction thereof to the difference between atmospheric pressure and the pressure in said suction duct between said sensor and said throttle members.
Claim 15
Dependent Claim
65 words
A system according to claim 11, in which said flow regulator comprises a valve having a valve plate and a diaphragm supporting said valve plate and separating a first and a second space, said first space having said spring mounted therein and being connected to said suction duct and said second space being connected through said supply line to a fuel container at atmospheric pressure.
Claim 16
Dependent Claim
29 words
A system according to claim 11, comprising means for taking off the pressure of said suction duct immediately downstream of said sensor member and close to the center thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |